将字符串从Java传递到JNI [英] Passing string from Java into JNI

问题描述

我想将一个字符串传递给我正在写的JNI，它必须分配给一个const char *。
下面提到我是如何做到的：

I want to pass a string into the JNI I am writing which have to be assigned to a const char*. The below mentioned is how I have done it:

JNI...(...,jstring jstr...){

const char* str = env->GetStringUTFChars(jstr,0);
env->ReleaseStringUTFChars(str,jstr,0);

}

但如果我在分配给constf * str之后打印它我所看到的jstring与我直接在JNI和printf中直接分配str值的情况不同。

But if i printf the const char* str after assigning to the jstring what I see is different as compared to when I assigned the str value directly in the JNI and printf from there.

这是正确的方法吗？或者是否还有其他方法可以将字符串从java分配给JNI中的const char *？

Is this the correct way to do? Or is there any other way to assign a string from java to const char* in JNI ?

推荐答案

java代码

public static native double myMethod( String path);  

C代码

JNIEXPORT jdouble JNICALL Java_your_package_structure_className_myMethod
(JNIEnv * env, jobject jobj, jstring path) {
     char * path;

    path = (*env)->GetStringUTFChars( env, path , NULL ) ;

• 更新后的链接


• Updated link

这篇关于将字符串从Java传递到JNI的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！